This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 63 |
| 2 | 2268 |
| 3 | 61236 |
| 4 | 1377810 |
| 5 | 27280638 |
| 6 | 491051484 |
| 7 | 8207574804 |
| 8 | 129269303163 |
| 9 | 1939039547445 |
| 10 | 27922169483208 |
| 11 | 388371993720984 |
| 12 | 5243021915233284 |
| 13 | 68965903654222428 |
| 14 | 886704475554288360 |
| 15 | 11172476391984033336 |
| 16 | 138259395350802412533 |
| 17 | 1683511461036241140843 |